William e



No. 623,264. Patenten Apr. I8, I899. w. E. SPARKS.

LOCK.

(Application filed m 2, 1898.)

(N u M o d e I WITNESSES I wl z I aka.

ATTORNEY,S'

lUNrTn STATES PATENT Erica.

WILLIAM E. SPARKS, OF NEIV HAVEN, CONNECTICUT, ASSIGNOR TO THE SARGENT & COMPANY, OF SAIWIE PLACE.

LOCK.

SPECIFICATION forming part of Letters Patent No. 623,264, dated April 18, 1899.

Application filed May 2,1898. Serial No. 679,433. (No model-l T 0 (all whom it ntcoy concern.-

Be it known that 1, WILLIAM E. SPARKS, a citizen of the United States, and a resident of the city and county of New Haven in the State of Connecticut,have invented certain new and useful Improvements in Locks, of which the following is a full, clear, and exact descrip tion when taken in connection with the accompanyin g drawings, which form a part thereof, and in which- Figure 1 represents a front elevation of a lock embodying my invention, the cap-plate being removed; Figs. 2 and 3, similar views with some of the parts in difierent positions; Fig. 4, a detail reverse view of the guard-lever, and Fig. 5 a detail view of the guard-bolt.

In all figures similar letters of reference represent like parts.

This invention relates to locks, and has for its object the construction. of a novel form of lock the increased security of which is obtained by the peculiar means set forth and claimed hereinafter.

In the drawings the parts designated by the letter A represent the usual case of the lock, and a the face through which the bolt 13 is adapted to extend.

C represents the hub, through the rectangular slot 0 of which the knob-spindle (not shown) may extend. The hub is shown herein as a single hub and is provided with two oppositely-disposed arms a for engagement with shoulders or lugs cl on a sliding yoke-plate D, so that upon turning the hubin either direction the yoke-plate is engaged andretracted. The yoke-plate D is guided in its movements by lugs or flanges a on the interior of the lock-case and is provided with a vertical flange cl for engagement with the T-shaped.

heel b of the bolt B. Pivoted on a stud d on the yoke-plate is a lever E, which bears with its free end 6 on the rear of the heel b of the bolt B. A spring F, secured to a post f on the casing,'is also attached by a hook e or other means to the lever E and tends to constantly hold the free end of the lever E against the bolt 13 to extend it.

The turning of the hub C to the right or left forces the yoke-plate D longitudinally inward, and the yoke-plate D by means of the engagement of its flange d with the bolt B retracts or draws the latter also inward. The lever E, on the other hand, through the tension of spring F, tends to force the bolt outward upon the release of the yoke-plate D from the pressure of the arms 0 of the hub C.,

The rotary cylinder of a pin-tumbler lock is shown at G with its bit g, which is adapted to engage with and operate the actuatinglever H, pivoted to a post h in the casing. One end 70 of an auxiliary lever K, pivoted to the post 7t, is adapted to be engaged by an arm h of the actuating-lever H when the latter is swung on its pivot by the bit of the cylinder G. The lower end k of the auxiliary lever K engages with the T-shaped heel b of the main bolt B to retract the same. A fiat spring J, secured to the actuating-lever H, bears against the upper end 70 of the auxiliary lever and tends to restore the actuating-lever H to its normal position. (Shown in Figs. 1 and 2.)

To retain the bolt in its locked position when engaged with the keeper of the door and prevent its retraction except by the use of the knob or key, a secondary or guard bolt L is provided. This guard-bolt is not provided with any mortise or socket in the keeper of the door, so that when the door is closed and the main bolt B is extended into its mortise or socket of the keeper the guard-bolt L is retracted, as shown in Fig. 2, and when so retracted releases mechanism to lock the main bolt in its extended position.

The guard-bolt L has a depending arm Z and a stud Z. To the stud Z and a post Z in the casing a spring M is secured, normally tending to keep the guard-bolt in'its extended position. (Shown in Fig. 1.) -A bell-crank lever or guard-lever N is provided with the arms a, n, and a and a spring 0 is secured to it and a post 0 in the casing, tending to hold it in the position shown in Fig. 2. When in such position, Fig. 2, the arm 'n of the lever is dropped downward behind the heel of the main bolt B, and thus prevents the main bolt from being retracted. hen, onthe other hand, the guard-bolt L is extended by the action of the spring M, the depending arm Z comes in contact with a teat n on the guardtoo lever N and swings the guard-lever on its pivot against the tension of the spring until the arm n is raised from engagement with the heel b of the main bolt, allowing the bolt to be retracted, if desired, Fig. 1. This position of the guard-bolt, guard-lever, and main bolt shown in Fig. 1 is assumed when the door is in its opened position and the bolts clearof the keeper. The arm n of the guardlever N limits its movement under pressure of the guard-bolt L by striking against an abutment a in the casing.

As the latch Z of the guard-bolt is shorter than the latch Z) of the main bolt, as the door is closed the keeper first'rctracts the main bolt B sufficiently for the heel Z) to clear the arm 'n, of the guard-lever N, so that the main bolt may be fully retracted prior to shooting into its socket or mortise of the keeper. As the guard-bolt is retracted the guard-lever is released, and as the main-bolt is shot into its mortise the guard-leverN is swung on its pivot by the spring 0 and the arm 91 drops into engagement in the rear of the heel of the main bolt to prevent any movement thereof.

To retract the main bolt (by means of the knob or key) when in its locked position in engagement with its keeper, as shown in Fig. 2, the guard-lever must first be swung out of engagement with the main bolt independently of the guard-bolt, which is in its retracted position. A toggle-link P is pivoted at one end to the under side of the arm n of the guard-lever N (see Fig. 4) and is adapted to bear with its other end in a socket d in the edge of the sliding yoke-plate D. Upon the retraction of the yoke-plate D and, by means of the flange d, the main 'bolt B the end of the link P in the socket d is forced backward and the arm n of the guard-lever N is swung upward sufficiently to clear the arm from engagement with the heel b of the main bolt B. The lifting effect of the link P takes place just prior to the retraction of the main bolt, so that the movement of the guard-' lever is very slight, Fig. 3. The link .P also acts to limit the reverse movement of the guard-lever N, so that the lever swings only so fa'ras necessary to engage with the heel of the main bolt B, as shown in Fig. 2.

\Vhen the guard-bolt L is retracted and the guard-lever N in engagement with the main bolt, the arm n of the lever N is swung forward to the position shown in Fig. 2, so that upon the movement of the actuating-lever H by the bit g of the cylinder G the free end of the lever- H will come in contact therewith and swing it rearward. By such rearward movement of the arm n by the actuating-lever H the guard-lever N is swung on its pivot and the arm n raised from engagement with the main bolt B. As the radius of the are described about the pivot h by the free end of lever H is greater than that of the are of the arm h, which operates the auxiliarylever K, the free end of the lever H travels faster, and

1. In a lock, the combination with the main bolt; of a cylinder-lock; a guard-lever pivoted to swing to engage the main bolt to lock it in its extended position; a spring normally tending to swing said guard-lever into such engagement; a pivoted actuating-lever operated by the bit of said cylinder-lock and when -so operated adapted to swing said guard-lever from engagement with said bolt, and retract said bolt, substantially as described.

2. In a lock, the combination with the easing of the lock; of the main bolt; a cylinderlock; a guard-lever pivoted to swing so that an arm thereof may engage the main bolt to lock it in its protracted position; a spring normally tending to swing said guard-lever into such engagement; an actuating-lever pivoted to the casing and swung on its pivot by the bit of said cylinder-lock to engage another arm of said guard-lever to swing it from engagement with said bolt, substantially as described.

3. In a lock, the combination with the main bolt; of a yokeplate capable of a limited sliding movement operated by the hub, and having an engagement with the main bolt to retract the same; a guard-lever pivoted to swing so that an arm thereof may engage the heel of the main bolt to lock it in its extended position; a spring normally tending to swing said guard-lever into such engagement; a toggle-link between said guard-lever and yokeplate, being pivoted to one member to swing the guard-lever from engagement with said main bolt upon the longitudinal movement of said yoke-plate, substantially as described.

4. In a lock, the combination with the main bolt; of a cylinder-lock; a pivoted actuatinglever operated by the bit of said cylinder; an auxiliary lever operated by said actuating lever and adapted to engage with and retract the main bolt; a guard-lever pivoted to swing so that an arin thereof may engage the heel of said main bolt to lock it in its extended position; a spring normally tending to swing said guard-lever into such engagement, said guard-lever being also engaged by said actuating-lever to be swung thereby out of engagement with said main bolt upon the operation of said key-bolt, substantially as described.

5. In a lock, the combination with the main bolt; of a yoke-plate capable of a limited 1ongitudinal movement operated by the hub and having an engagement with said main bolt to retract the same; a pivoted actuating-lever operated by a cylinder-lock; an auxiliary lever operated by said actuating-lever and adapted to retract said main bolt; a guardlever pivoted to swing so that an arm thereof l lever from said main bolt, snbstantiallyas de- IO may engage with said main bolt and lock it scribed. a in its extended position; a spring normally In witness whereof I have hereunto set my tending to swing said guard-lever into such hand this 27th day of April, A. D. 1898. engagement; and a guard-bolt which when in its extended position engages with and swings said guard-lever from such engagement; and Vitnesses: mechanisms connected with said actuating- VILLIAM S. COOKIE, lever and yoke-plate to disengage said guard- \VILLIAM E. SPARKS.

CHARLES L. BALDWIN. 

